Reverse Gran Titration for Alkalinity Determination
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Solution Overview
Problem
Current methods for determining total alkalinity in seawater are often inaccurate, require frequent calibration, and involve large sample sizes, as well as a priori knowledge of constituents, which limits precision and efficiency.
Innovation Solution
The Reverse Gran titration method uses a known volume of acidic fluid and alkaline fluid to determine alkalinity through pH and temperature measurements, calculating the transformation of selected ions without the need for frequent acid calibration, allowing for precise and accurate measurements with minimal sample size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional alkalinity determination methods are used, then measurement can be performed, but measurement precision is reduced and frequent calibration is required
Solution Approach 1:
The patent inverts the traditional titration approach by reversing the roles of acid and base. Instead of adding acid to alkaline seawater, the method adds alkaline fluid to acidic fluid, measuring pH changes as alkalinity increases. This inversion eliminates the need for frequent acid calibration while maintaining measurement precision, as the alkaline titrant serves as the reference standard.
Solution Approach 2:
The patent changes the measurement parameters by monitoring pH changes during alkaline addition rather than acid addition. By tracking the transformation of selected ions through pH measurements and applying the Gran function, the method achieves high precision alkalinity determination without requiring frequent calibration of the acidic reagent.
2Quantity of substance
If traditional titration methods are used, then alkalinity can be determined, but large sample sizes are required
Solution Approach 1:
The patent applies preliminary action by pre-selecting the acidic fluid volume and concentration before the titration begins. This allows for optimized small sample sizes since the acidic reference fluid is prepared in advance with known properties, enabling precise alkalinity determination of minimal seawater samples through controlled alkaline addition and pH monitoring.
3Loss of information
If traditional methods are used, then alkalinity determination can be performed, but prior knowledge of constituents is required
Solution Approach 1:
The patent extracts and eliminates the requirement for a priori knowledge of seawater constituents by using the Gran function approach. The method determines alkalinity directly from pH measurements during alkaline addition to acidic fluid, without needing to know the specific composition or concentrations of carbonate system components in advance.
4Measurement precision
If frequent calibration is performed, then measurement accuracy is maintained, but time consumption increases
Solution Approach 1:
By inverting the titration roles and using alkaline fluid as the titrant added to acidic reference fluid, the method eliminates the need for frequent acid calibration. The alkaline titrant can be prepared as a stable standard solution that requires minimal recalibration, significantly reducing calibration time while maintaining measurement accuracy through the Gran function calculation approach.
Data Source
AI summary
Alkalinity determination, including an alkalinity determination process and/or alkalinity determinator. An alkalinity determination process may include providing a known value of volume of an acidic fluid, forming a titration system by providing one or more additions of a known value of volume of a relatively alkaline fluid to an acidic fluid, determining a pH value and/or a temperature value for one or more additions and/or determining an alkalinity value of a system by calculating a transformation including one or more determined pH values and/or temperature values of one or more additions. An alkalinity determination process may include modeling, such that an informed determination may be made with reference to relevant and/or irrelevant factors, as well as parameters to maximize likelihood of alkalinity determination. In embodiments, an alkalinity determinator may include one or more titration cells, one or more sensors and/or one or more alkalinity value determinators.